show you two pictures of arthur davis. this one, with the president, was taken in 2006, in afghanistan, when davis was in charge of our embassy security there. this is a mug shot they took a couple of years later in the harris county jail, one year after his retirement from the corps. >> davis: one of the things i... i swore that i'd never do was go to jail. and for seven days, i was in the county jail, trying to figure out what was i going to do, thinking about all the things that i screwed up on, all the hard work that i've put myself through to get to this point in my life where i could say, you know, "i did a good job." and i screwed it all up. i thought my life was over. >> pelley: it could have been over. he faced up to 20 years for assault with a deadly weapon. davis, drunk and in a rage, took a gun and a knife to a fight with a neighbor. >> davis: it was just too much for me to deal with. you know, i thought i was the toughest person i knew, i could handle anything. but i couldn't deal with my own demons. >> pelley